AMD64 dma_alloc_coherent crashes on non PCI device (was SATA open bugs)

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> > http://bugzilla.kernel.org/show_bug.cgi?id=8424 - patch review
> This one is on Alan.

I think not - something horrible is happening in dma_alloc_coherent when
called from dmam_* with a non PCI device


Seems to be some kind of AMD64 specific DMA mapping bug ?
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